Improve capitalization in AI API flags descriptions

[alexandear]

This is for consistency with other flags.

gosec -v before:

OPTIONS:

  -ai-api-key string
        key to access the AI API
  -ai-api-provider string
        AI API provider to generate auto fixes to issues.
        Valid options are: gemini
  -ai-endpoint string
        endpoint AI API.
        This is optional, the default API endpoint will be used when not provided.
  -color
        Prints the text format report with colorization when it goes in the stdout (default true)

go run ./cmd/gosec -v after:

OPTIONS:

  -ai-api-key string
        Key to access the AI API
  -ai-api-provider string
        AI API provider to generate auto fixes to issues.
        Valid options are: gemini
  -ai-endpoint string
        Endpoint AI API.
        This is optional, the default API endpoint will be used when not provided.
  -color
        Prints the text format report with colorization when it goes in the stdout (default true)

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.66%. Comparing base (1216c9b) to head (cbef185).
Report is 18 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1267      +/-   ##
==========================================
- Coverage   68.49%   66.66%   -1.84%     
==========================================
  Files          75       75              
  Lines        4384     5186     +802     
==========================================
+ Hits         3003     3457     +454     
- Misses       1233     1581     +348     
  Partials      148      148              

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